"Marc Levenson" wrote in message
...

| You don't see any corals suffering from the initial contact of this stuff?
Even
| though dissolved, it must be acidic to some degree, right? It would be
hard to
| pour it into any area of my tank and not have it make contact pretty
quickly
| with livestock.

The corals will only suffer if the slurry lands on them and stays. Kalk is
very, VERY alkaline (acidic = low pH). In fact it is so alkaline (basic)
that if left on a sensitive area of skin, it can burn even you.
What I've found to be a good wat to dose it is to use a piece of
unrestricted airline tubing, and just start a siphon. It takes about 4-5
minutes to drain 3 quarts (the wifes kool-aid pitcher...shhhhhh!) this way.
You could put the tubing outlet right in front of one of the returns (one
that doesn't point right at any corals), and at the slow rate the tubing
drains the slurry, it will have plenty of time to mix with the tank water.

HTH,
Kev